CVE-2026-91771Disclosure

LOWCVSS 8.7 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch affected systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

Weights & Biases wandb before 0.29.0 fails to validate the file name from server responses in the File.download function, allowing path traversal attacks. Attackers controlling the backend can supply file names with directory traversal sequences to write files outside the intended download directory, potentially enabling code execution through modification of shell startup files or Python import paths.

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2.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.valtersit.com/cve/CVE-2026-91771/

Full discourse1 post

Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters45d
Disclosure
CVE-2026-91771: path traversal in Weights & Biases wandb before 0.29.0 lets a malicious backend write files outside the download dir, potentially RCE via shell startup or Python import paths. CVSS 8.8. Patch still under https://www.valtersit.com/cve/CVE-2026-91771/ #CVE #infosec #cybersecurity #WeightsBiases #CVEALERT #CVE #infosec #Linux #XSS #valtersit #snippet #SysAdmin #cybersecurity #devsecops #devops #developer #100daysofcode #git #github #gitlab #redteam #blueteam #ethicalhacker #cybersecurityawareness #cybersecuritynews #cybersecuritytips #python #hacker #kali #ubuntu #debian #docker
Post summary
The tweet discloses CVE-2026-91771, a path traversal flaw in Weights & Biases wandb with CVSS 8.8 and potential RCE impact, noting a patch is under review.
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